Receiver for teleprinters



y 31, 1951 c. SEGAAR 2,562,825

RECEIVER FOR TELEPRINTERS Filed Jan. 7, 1948 2 Sheets-Sheet l 2 7/ 7; 52 49 43 5 INVENTOR.

C. SEGAAR RECEIVER FOR TELEPRINTERS July 31, 1951 v 2 Sheets-Sheet 2 Filed Jan. '7, 1948 {NVE TOR.

Patented July 31 1951 RECEIVER FOR TELEPRINTERS Cornelis Segaar, The Hague, Netherlands Application January 7, 1948, Serial No. 894 In the Netherlands January 3, 1947 Section 1, Public Law 690, August 8, 1946 Patent expires J anuary 3, 1967 6 Claims.

' The present invention relates to a type printing telegraph receiver, and more particularly to a receiver in which the signal to be printed is determined by the angle swept-through by a positioning shaft, which is provided with a typewheel'.

In known type printing telegraph receivers of the type referred to the positioning shaft is provided with a number of limiting discs provided with stops, the number of stops of each limiting discs being double the number of stops of the disc preceding in sequence of operation.

A number of locking levers, equal to the number of limiting discs, are positioned in timed se quence under the control of the code elements of the received signal and are engaged with the stops of the relevant limiting discs, so as to selectively permit the positioning shaft and the type wheel to rotate about fractions of a revolution, such as one-half, one-quarter, one-eighth, and so on, or to prevent the positioning-shaft from rotating.

Anarrangement is known in which the looking levers corresponding to the 2-5th impulse of a signal element in the 5-unit code, are positioned in timed sequence under the direct control of the armature of the receiving magnet. Such a direct control, without application of intermediate wiping levers, involves the drawback that it is necessary to make use of locking levers carrying out two motions, viz. a rotation and a vertical translation. This results in marginal actions and furthermore great care is required in manufacturing these mechanisms, to adjust the many abutments of the levers in such a way, that the mentioned motions are carried out in a smoothand exact manner.

The type printing receiver according to the present invention avoids these drawbacks by the application of intermediate wiping levers, the number of which is equal to the number of signal elements. These wiping leverscooperate with a corresponding number of cam discs provided on the receiver shaft. As a result the two functions of wiping of the signal elements and looking. of the positioning shaft, are distributed in the arrangement according to, the invention to different levers, each of these levers carrying out only one kind of motions, that is to say rotations, whereby a simple construction is obtained which may be adjusted in a very easy way.

It is also known to replace the armature of the receiving magnet by a numberof 'armatures equal to the number of elements of the code and to reduce the necessary power of the receiving magnet by the application of wiping levers, which are moved in timed sequence from a home posit1on into an operated position by corresponding cam discs provided on the receivershaft, in such a manner, that an armature about at the middle of the relevant signal element is moved to the magnet and remains in the attracted position, if

relevant signal element carries no current (marking time) ,so that the armature falls back. With wiping mechanisms of this type an important improvement is obtained in working conditions with respect to the receiving mechanism working in combination with a common armature for all the signal elements of the code.

It is therefore an object of the present invention to provide a selecting mechanism for type printing telegraph receivers, comprising a re ceiving magnet which is provided with a number of armatures co-operating with an equal number of cam discs and levers, corresponding to the number of signal elements of the telegraph signal, the wiping levers being provided each with a pawl which during the movement of the wiping lever nearing an armature to the receiving magnet moves freely over a projection of the additional locking lever about at the middle of the relevant signal element, this wiping lever being locked at the reception of a signal element of the first kind (e. g. marking current), while at the reception of a signal element of the other kind (spacing current) this wiping lever beneath the operated armature falls back into thehome position under the influence of a spring, the pawl engaging the additional locking lever with the relevant cam disc on the positioning shaft of the typewheel, under release of locking levers operated before, by pushing away, a common pawl bar.

The invention is shown in the drawings which show the constructions only so far as necessary for the explanation of the invention.

Fig. l shows the part of the receiving mechanism belonging to the first signal element;

Figs. 2-5 represent those parts of the receiving mechanism which respectively belong to the 2nd- 5th signal element;

Fig. 6 illustrates thereleasing mechanism of the positioning shaft, which is operated at the end of the last signal element;

Fig. 7 is a perspective view of the assembled apparatus according to the present invention, some parts being omitted, for the sake of c1ear-- HESS.

Referring now to the drawings and first to Fig. 7 the device according to the present invention is adapted to work in afive-unit code. In Fig. 7 only two complete combinations of receiving magnet armatures, cam discs on thereceiver shaft, wipinglevers with spring-loaded .pawls, locking levers and limiting discs on the positioning shaft are shown; the complete device contains five .of these combinations, three of which, however, have been omitted in Fig. 7 for the sake of cleamess together with the framework of .the device. The receiving magnet l' in the no-printing condition of the apparatus keeps the five armatures 4+6 operated against the operation of the five armature springs 1-1 I. The receiving. magnet I has only been indicated in Fig. l. The'typeprinting telegraph according to the example uses singleourrent signals. It is, however, easily possible'to equip a receiving magnet for double-current signals. The first element of. a single-current signal, the so-called start-element; carries. no current '50 that the armatures 2-'-5 are released under the operation of the springs 1ll-',and"in a manner described in 'Modern Telegraphyby.A.

Jipp, pages and following, pushthe bracket59 away thereby releasing for one revolution ashaft 12 that is driven constantly over a slip-coupling. This shaft l2, while'interswitching an orienta- "tion device of a known kind, drives a sleeve with cam discs l3-l8. Each of the cam discs 13-" co-operates with'oneof thewiping levers IS-23, respectively, that are revolvable around a common stationary shaft 52 'andare pushed against the discs by the springs 60-64. Each of these discs'is provided with a cam, which, when revolved, about at the middle of the relevant element of the signal moves the corresponding wiping lever to the left, -so that the'latter by means of the slanting side at the top approach the armature to the receiving magnet. The right hand top part of the wiping lever moves a little past the left hand side ofa' cam provided at the lower side of the armature, in order to enable the armature, at a spacing signal element, to release and to lock therelevantwiping lever so that the latter'cannot fall back.

When the wiping lever [9 in Fig. 1' moves to the left, the pawl '25 touches the projecting part on the right. hand upper side of the locking lever 31. The pawl turns a little to'the right, 'jumps across the mentioned projection, and after having passed it, springs back into the shown position in the wiping lever l 9 under the operation of .the spring 3|. The position of .the .locking' lever 31, which freely rotates about ashaft 55 common to all looking levers 31-42, and the moving. of which is limited by the pin 56, remains 'unm'odified. The mechanism belonging to the firstsignal element of the signal is not operated further if this signal element is spacing. If this signalelement is, however, a marking'element, i. e. carries a current, the wiping lever l9 after the wiping action falls back underneath the operated armature 2 into the shown position, whereby the pawl pushing against the pr j n th ri ht hand upper side of the locking lever 31, turns this lever to the right, the common pawl bar being pushed downward, after which the .relevantlock- .ing lever 31 islocked with the tooththat is projecting to the left, in the path of thecam of a disc 44 secured to a shaft43 common to all cam discs 49-49.

. The movements ofthelocking lever 31 and. the pawl 25 are such that the wiping lever wean return to the shown home position. The typeprinting telegraph receiver according to the invention is preferably equipped with a typewheel (not shown) on the shaft 43. It is, however, also possible, to operate a basket with typehammers, starting from the shaft 43. The shaft 43 of the "typewheel, which is driven e. g.over a slip-coupling, bears 6 cam discs 44--43, the first five corresponding to the five signal elements of a disc with double the number of cams as the preceding one so .that the fifth disc 43 is provided with 16. cams. The sixth disc has only one cam having the diametrically opposite position to the camof the first disc 44.

The common pawl bar 50 is pushed so far downward by the relevant locking lever so thatlthe locking lever '42 ;(Fig. 6) owing to the operation of the-spring. "ll.:moves around. the stationary shaft 55, limited by the pin 56, so that the tip on the left hand side of the locking lever 42 releases the disc 49. The shaft 43, now rotates until the cam of the disc 44 (Fig. 1) rests against the tip of the locking lever 31; which was operated under the control of the. first signal element. The positioning shaft '43 of the typewheel under the control of the first signal-element of the signal can either or not make a half revolution according to the nature of the first signal element. Under'control of the second signal element thelocking lever 38' (Fig. 2) is operated and is locked. by

the common pawl bar 50, the preceding locking lever 31 which had been engaged with the cam disc 44, being released.

Dependent on the kind of the second signal element the positioning'shaft 43 of the typewheel can either or not make revolution, while under control of the third, the fourth and the fifth signal element, respectively, /3, 5' and 1-1 revolution can be'made, so that by the combination of current carrying and no current carrying signal elements one spacing position and 31 marking positions result in the-positioning shaft 43 of the type'wheel. In connection with the choice of the speed of the positioning shaft 43 it may be useful to choose another sequence of the mentioned r-cam discs 44-48 with relation to the signal ele- .ments.

The typewheei is securely positioned at the'end of the last signal element. Printing can follow at that moment, preferably in a manner described in U. S; patent application Serial No; 767,537, filed .August 6, 1947, now U. S. Patent'No. 2,551,693 of .May 8, 1951. After having printed the positioned signal the typewheel'is released by the mechanisni shown'in' Figure 6 and returned to the start- .ing position.

. About at the beginning of the so-called stop element .of the signal the wiping lever 24 (Fig. 6) is moved to'the left to move partly back directly afterwards. Thus the locking lever 42 is brought. in the path of the cam of the disc 49. =As soon as the last action has been completed, the bracket 59 (Figs. 1-5) approaches all the armatures to the receiving. magnet, which armatures now remain in the attracted position, as the so-called stop element is continuously current-carrying. Almost simultaneously the common pawl bar 50v is pushed down by means of the cam 58 and the wiping lever 53 (both shown in .dotted lines in the drawings) to such an extent that any wiping lever, which is still in the left hand position, and is locked in that position under the control of a spacing signal element by the corresponding armature in unattracted position, can spring back into the right hand position under the operation 01' the respective springs, whereby the corresponding locking levers can be operated just a while under the operation of the pawls but return directly in the shown position owing to the pawl bar 50 which is still lifted. Then the pawl bar 50 looks the looking lever 42, which determines the start position of the typewheel, the wiping lever 24 with the pawl 30 being enabled to return to the shown position.

While I have illustrated and described what I regard to be the preferred embodiment of my invention, nevertheless it will be understood that such is merely exemplary and that numerous modifications and rearrangements may be made therein without departing from the essence of the invention, I claim:

1. A printing telegraph receiver comprising in combination, a receiver shaft; a plurality of wiping members arranged for cooperation with said receiver shaft so as to carry out motions from and into normal positions at predetermined times individual to each of said Wiping members; a positioning shaft; a plurality of locking members each being associated with one of said wiping members and arranged for cooperation with said positioning shaft at predetermined positions of said positioning shaft; and means for coupling each of said locking members to said associate wiping members only during part of the return motion of said associate wiping member into normal position.

2. A printing telegraph receiver comprising in combination, a receiver shaft; a plurality of wiping members arranged for cooperation with said receiver shaft so as to carry out motions from and into normal positions at predetermined times individual to each of said wiping members; a positioning shaft; a plurality of looking members each being associated with one of said wiping members and arranged for cooperation with said positioning shaft at predetermined positions of said positioning shaft; and springloaded members arranged, respectively, on said wiping members for coupling each of said locking members to said associate wiping members only during part of the return motion of said associate wiping member into normal position.

3. A printing telegraph receiver comprising in combination, a receiver shaft; a plurality of wiping members arranged for cooperation with said receiver shaft so as to carry out motions from and into normal positions at predetermined times individual to each of said Wiping members; a positioning shaft; a plurality of locking members each being associated with one of said wiping members and arranged for cooperation with said positioning shaft at predetermined positions of said positioning shaft; and springloaded pawls arranged, respectively, on said wiping members for coupling each of said locking members to said associate wiping members only during part of the return motion of said associate wiping member into normal position.

4. A printing telegraph receiver as claimed in claim 1 and a pawl-bar common to all of said locking members and arranged for cooperation with said locking members so as to lock said locking members in cooperative position with said positioning shaft.

5. A printing telegraph receiver as claimed in claim 1 and a pawl-bar common to all of said locking members and arranged for cooperation with said locking members so as to lock said locking members in cooperative position with said positioning shaft; and means for releasing upon coupling any of said locking members with said associate wiping member the other ones of said locking members.

6. A printing telegraph receiver as claimed in claim 1 and a pawl-bar common to all of said locking members and arranged for cooperation with said locking members so as to lock said locking members in cooperative position with said positioning shaft; and means associated with said locking members for pushing said pawl-bar out Of the locking position upon coupling any of said locking members with said associate wiping member.

CORNELIS SEGAAR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,800,978 Wusteney Apr. 14, 1931 2,192,354 Kleinschmidt Mar. 4, 1940 2,329,580 Bancroft Sept. 14, 1943 2,358,477 Salmon Sept. 19, 1944 

